Help w/ Polynomials!!

Question

A swimming pool has the dimensions shown. A uniform walkway that is the same distance on all sides of the pool is built around the swimming pool.

Which of the polynomials could be used to represent the combined area of the swimming pool and the sidewalk?

A.

B.

C.

D.

Answer 1

The area in question is the area of the pool, with a 2x extension on each side. So the equation of the entire area is (15+ 4x)(8+4x)

Multiplying 120 + 92x +16x^2

D is the correct answer